Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1000-1111-0010 pattern in any orientation.
A146402
Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1000-1111-0010 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =1a(9) =1a(10) =1a(11) =1a(12) =7a(13) =7a(14) =21a(15) =21a(16) =51a(17) =51a(18) =261a(19) =261a(20) =1539a(21) =1539a(22) =11759a(23) =11759
External references
- oeis: A146402